package com.jsbj.tools;

import org.apache.commons.lang3.time.DateFormatUtils;

import java.lang.management.ManagementFactory;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * 时间工具类
 * 
 * @author djzhgd
 */
public class DateUtils extends org.apache.commons.lang3.time.DateUtils
{
    public static String YYYY = "yyyy";

    public static String YYYY_MM = "yyyy-MM";

    public static String YYYY_MM_DD = "yyyy-MM-dd";

    public static String YYYYMMDDHHMMSS = "yyyyMMddHHmmss";

    public static String YYYY_MM_DD_HH_MM_SS = "yyyy-MM-dd HH:mm:ss";

    private static final SimpleDateFormat sftYMDHMS = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    
    private static String[] parsePatterns = {
            "yyyy-MM-dd", "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd HH:mm", "yyyy-MM", 
            "yyyy/MM/dd", "yyyy/MM/dd HH:mm:ss", "yyyy/MM/dd HH:mm", "yyyy/MM",
            "yyyy.MM.dd", "yyyy.MM.dd HH:mm:ss", "yyyy.MM.dd HH:mm", "yyyy.MM"};

    /**
     * 获取当前Date型日期
     * 
     * @return Date() 当前日期
     */
    public static Date getNowDate()
    {
        return new Date();
    }

    /**
     * 获取当前日期, 默认格式为yyyy-MM-dd
     * 
     * @return String
     */
    public static String getDate()
    {
        return dateTimeNow(YYYY_MM_DD);
    }

    public static final String getTime()
    {
        return dateTimeNow(YYYY_MM_DD_HH_MM_SS);
    }

    public static final String dateTimeNow()
    {
        return dateTimeNow(YYYYMMDDHHMMSS);
    }

    public static final String dateTimeNow(final String format)
    {
        return parseDateToStr(format, new Date());
    }

    public static final String dateTime(final Date date)
    {
        return parseDateToStr(YYYY_MM_DD, date);
    }

    public static final String parseDateToStr(final String format, final Date date)
    {
        return new SimpleDateFormat(format).format(date);
    }

    public static final Date dateTime(final String format, final String ts)
    {
        try
        {
            return new SimpleDateFormat(format).parse(ts);
        }
        catch (ParseException e)
        {
            throw new RuntimeException(e);
        }
    }

    /**
     * 日期路径 即年/月/日 如2018/08/08
     */
    public static final String datePath()
    {
        Date now = new Date();
        return DateFormatUtils.format(now, "yyyy/MM/dd");
    }

    /**
     * 日期路径 即年/月/日 如20180808
     */
    public static final String dateTime()
    {
        Date now = new Date();
        return DateFormatUtils.format(now, "yyyyMMdd");
    }

    /**
     * 日期型字符串转化为日期 格式
     */
    public static Date parseDate(Object str)
    {
        if (str == null)
        {
            return null;
        }
        try
        {
            return parseDate(str.toString(), parsePatterns);
        }
        catch (ParseException e)
        {
            return null;
        }
    }
    
    /**
     * 获取服务器启动时间
     */
    public static Date getServerStartDate()
    {
        long time = ManagementFactory.getRuntimeMXBean().getStartTime();
        return new Date(time);
    }

    /**
     * 计算两个时间差
     */
    public static String getDatePoor(Date endDate, Date nowDate)
    {
        long nd = 1000 * 24 * 60 * 60;
        long nh = 1000 * 60 * 60;
        long nm = 1000 * 60;
        // long ns = 1000;
        // 获得两个时间的毫秒时间差异
        long diff = endDate.getTime() - nowDate.getTime();
        // 计算差多少天
        long day = diff / nd;
        // 计算差多少小时
        long hour = diff % nd / nh;
        // 计算差多少分钟
        long min = diff % nd % nh / nm;
        // 计算差多少秒//输出结果
        // long sec = diff % nd % nh % nm / ns;
        return day + "天" + hour + "小时" + min + "分钟";
    }
    
    public static String getFirstDayPreMonth() {
    	SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
    	Calendar cal_1 = Calendar.getInstance();//获取当前日期
    	cal_1.add(Calendar.MONTH, -1);
    	cal_1.set(Calendar.DAY_OF_MONTH,1);//设置为1号,当前日期既为本月第一天
    	String firstDay = format.format(cal_1.getTime()) + " 00:00:00";
    	return firstDay;
    }
    
    public static String getEndDayPreMonth() {
    	SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
    	Calendar cale = Calendar.getInstance();
    	cale.set(Calendar.DAY_OF_MONTH,0);//设置为1号,当前日期既为本月第一天
    	String lastDay = format.format(cale.getTime()) + " 23:59:59";
    	return lastDay;
    }


    /**
     * 获取过去第几天的日期
     *
     * @param past
     * @return
     */
    public static String getPastDate(int past) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(new Date());
        calendar.set(Calendar.DATE, calendar.get(Calendar.DATE) - past);
        Date today = calendar.getTime();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        String result = sdf.format(today);
        return result;
    }

    // 将日期转换成字符串 年月日时分秒 YYYY-MM-DD HH:mm:ss
    public static String formatYMDHMS(Date date){
        String strDate = "";
        strDate = sftYMDHMS.format(date);
        return strDate;
    }
    // 将字符串转换成日期格式 年月日时分秒 yyyy-MM-dd HH:mm:ss
    public static Date parseYMDHMS(String strDate) throws ParseException {
        Date date = sftYMDHMS.parse(strDate);
        return date;
    }

    //计算两个日期之间相差几天
    public static long getDayPoor(Date endDate, Date startDate){
        if(endDate==null || startDate==null){
            return 0l;
        }
        Long starTime=startDate.getTime();
        Long endTime=endDate.getTime();
        Long num=endTime-starTime;//时间戳相差的毫秒数
        return num/24/60/60/1000;//除以一天的毫秒数
    }
}
